diff --git a/pkgs/tools/backup/btrbk/default.nix b/pkgs/tools/backup/btrbk/default.nix
index 36bd2065de7e..ed98074f2e65 100644
--- a/pkgs/tools/backup/btrbk/default.nix
+++ b/pkgs/tools/backup/btrbk/default.nix
@@ -69,5 +69,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl3Only;
     platforms = platforms.unix;
     maintainers = with maintainers; [ asymmetric ];
+    mainProgram = "btrbk";
   };
 }